serialization - 尽管有 JsonSerializer 设置，SignalR 仍未序列化 NodaTime 类型

Question

我遇到 NodaTime 类型和 SignalR 参数的序列化问题(异常)，例如

Error converting value to type 'NodaTime.ZonedDateTime

Error converting value \"2016-06-01T18:33:36.7279685+01 Europe/London\" to type 'NodaTime.ZonedDateTime'. Path '[0].DateCreated', line 1, position 79.

尽管遵循了 docs并替换默认的 JsonSerializer 并使用 NodaTime 扩展方法和 JSON.net nuget 包，例如

JsonSerializerSettings js = new JsonSerializerSettings();
js.ConfigureForNodaTime(DateTimeZoneProviders.Tzdb);
var serializer = JsonSerializer.Create(js);
GlobalHost.DependencyResolver.Register(typeof(JsonSerializer), () => serializer);

Answer 1

很高兴从 here 中找到了解决方法感谢BrannonKing

本质上，它为 SignalR 参数使用客户解析器，该参数使用正确的序列化器而不是创建默认序列化器。

也引用了 SO here但当然只发现曾经开始发布我自己的问题；)

在此处重新发布以供其他谷歌搜索(优秀)NodaTime具体来说，并分享我需要的其他一些序列化修复，例如:

Newtonsoft.Json.JsonSerializationException: Self referencing loop detected for property X with type Y Path Z

服务器启动

public void Configuration(IAppBuilder app)
{
    JsonSerializerSettings js = new JsonSerializerSettings();
    js.ConfigureForNodaTime(DateTimeZoneProviders.Tzdb);
    js.DateParseHandling = DateParseHandling.None;
    js.ReferenceLoopHandling = ReferenceLoopHandling.Serialize;
    js.PreserveReferencesHandling = PreserveReferencesHandling.Objects;
    var serializer = JsonSerializer.Create(js);
    GlobalHost.DependencyResolver.Register(typeof(JsonSerializer), () => serializer);
    var resolver = new Resolver(serializer);
    GlobalHost.DependencyResolver.Register(typeof(IParameterResolver), () => resolver);
}

自定义参数解析器

public class Resolver : DefaultParameterResolver
    {
        private readonly JsonSerializer _serializer;

        public Resolver(JsonSerializer serializer)
        {
            _serializer = serializer;
        }

        private FieldInfo _valueField;
        public override object ResolveParameter(ParameterDescriptor descriptor, Microsoft.AspNet.SignalR.Json.IJsonValue value)
        {
            if(value.GetType() == descriptor.ParameterType)
            {
                return value;
            }

            if(_valueField == null)
                _valueField = value.GetType().GetField("_value", BindingFlags.Instance | BindingFlags.NonPublic);

            var json = (string)_valueField.GetValue(value);
            using(var reader = new StringReader(json))
                return _serializer.Deserialize(reader, descriptor.ParameterType);
        }
    }

非常感谢布兰农!